feat: implements text/event-stream(SSE) MIME parser (#1416)

Co-authored-by: 007gzs <007gzs@gmail.com>

plugins/wasm-rust/example/sse-timing/envoy.yaml

@@ -0,0 +1,76 @@
+# Copyright (c) 2023 Alibaba Group Holding Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+static_resources:
+  listeners:
+    - name: listener_0
+      address:
+        socket_address:
+          protocol: TCP
+          address: 0.0.0.0
+          port_value: 10000
+      filter_chains:
+        - filters:
+            - name: envoy.filters.network.http_connection_manager
+              typed_config:
+                "@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
+                stat_prefix: ingress_http
+                route_config:
+                  name: local_route
+                  virtual_hosts:
+                    - name: local_service
+                      domains: ["*"]
+                      routes:
+                        - match:
+                            prefix: "/"
+                          route:
+                            cluster: sse-server
+                http_filters:
+                  - name: envoy.filters.http.wasm
+                    typed_config:
+                      "@type": type.googleapis.com/udpa.type.v1.TypedStruct
+                      type_url: type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
+                      value:
+                        config:
+                          name: "http_body"
+                          configuration:
+                            "@type": type.googleapis.com/google.protobuf.StringValue
+                            value: |-
+                              {
+                                "name": "sse_timing",
+                                "_rules_": []
+                              }
+                          vm_config:
+                            runtime: "envoy.wasm.runtime.v8"
+                            code:
+                              local:
+                                filename: "/etc/envoy/proxy-wasm-plugins/sse_timing.wasm"
+                  - name: envoy.filters.http.router
+                    typed_config:
+                      "@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
+  clusters:
+    - name: sse-server
+      connect_timeout: 30s
+      type: LOGICAL_DNS
+#      dns_lookup_family: V4_ONLY
+      lb_policy: ROUND_ROBIN
+      load_assignment:
+        cluster_name: sse-server
+        endpoints:
+          - lb_endpoints:
+              - endpoint:
+                  address:
+                    socket_address:
+                      address: sse-server
+                      port_value: 8080